Unfortunately, there is no good way to truly remove the last few characters from a String; they are "immutable", meaning that, once created, they may not be changed. In order to "Edit" a string, you always have to have a round-about way of doing so; you have to create a new String with the desired information. Substring does just that, so take your string (let's assume the String you want to "remove" characters from is declared as "String s;"), and assign it to itself using Substring:
s = s.Substring(0, s.Length - numCharsToRemove);
The first argument (0) just means that the Substring should start including characters at position 0. The next argument is how many charactesr to include, so by taking the String's length minus however many characters you want to "remove", we effectively cut off the last few characters of the String.
I realize the question was basically already answered (though not officially), but I figured you may benefit from a more detailed explanation.
Hope it helps,
Nate

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